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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc5cdc1eb98c9b09ff8ca4da15f03ff7f33225bb592cc7d888e1f8e4a2b2449' 
  AND token = 'qpOhUtXO7YK/OUX9E9cAkXieM+uYiJPeBMxupiRCwH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}